Final answer:
The Master Node and Search Heads in a clustered Indexer environment must be on the same major version to ensure compatibility and proper functioning of the Splunk Enterprise system.
Step-by-step explanation:
The question refers to the version compatibility requirements within a Splunk clustered environment, specifically between the Master Node and Search Heads when dealing with a clustered Indexer setup. In such an environment, it is crucial for the master node and search heads to be on the same major version. Version mismatches can lead to inconsistencies and operational issues. For example, in a Splunk Enterprise environment, if you're running Splunk version 8.x on your Indexer cluster, the master node and search heads should also be running a compatible 8.x version. This ensures that any new features, bug fixes, and performance improvements are consistent across the distributed environment.